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4

406

Strength of Riveted Joints.

Example n.  A wrought-iron suspension bridge chain supports
32 tons.    Find its cjiniensions and draw the joint to scale.

Here

(x'2)      = 16 tons   and^=/\/j6~ _
~   '66x4   =   2'64             di

w  i '66 x 4   = 6*64
and the whole is drawn in Fig. 355.

t = *2 x 4 = *8

Strength of Riveted Joints.  A boiler plate may be
supposed to consist of similar links to the above, but with some
redundant material between (see Figs. 356 and 357). The joint

*y

-+-I

l_i

illl

PH-fiH

if H;1? L-.fa^

!

*w

Li

T

J

.1

of

f
I

jEr&ruqth/ of-

may give way by (i) shearing the rivet, (2) tearing the plate
between rivets, (3) cross-breaking at ^, and (4) crushing by
reason-of too thin a plate.